Intergrate the SVM Account Increase Balance

[YaronWittenstein]

After the FFI layer of SVM will expose the Increase Account Balance functionality, it should be integrated to go-svm
(see SVM Issue: spacemeshos/svm#377)

Right now, go-svm has a place-holder for that feature:

go-svm/svm/api.go

Lines 274 to 276 in 710604c

	func (rt *Runtime) IncreaseBalance(addr Address, amount Amount) {
	panic("TODO")
	}

[neysofu]

Closed by #29.